Validator.nu alt advice
The purpose of this page is to enable collaborative creation of advisory text for certain cases of
alt usage so that this advice can be displayed by Validator.nu. Note that like the rest of this wiki, editing requires you to agree to release your contributions under the MIT license (see wiki footer). Please note that while copying text from the WHATWG version of HTML 5 is OK, copying text from RFCs or W3C specs is not OK.